Lemon Blueberry Crumble (With Creamy Mascarpone)

This Lemon Blueberry Mascarpone Crumble is a decadent, three-layer masterpiece. Beneath a buttery, crispy shortbread almond crumble topping lies a thick, jammy lemon-blueberry filling contrasted by velvety, rich pockets of sweetened lemon mascarpone cheese.

It’s elegant enough for a dinner party, yet simple enough to whip up on a cozy weekend. Here is how to make this ultimate summer-meets-spring dessert.

Why This Recipe is Next-Level

• The Mascarpone Layer: Mascarpone adds a luxurious, creamy, cream-cheese-like richness that beautifully balances the tartness of the lemon and the sweetness of the berries.
• The Shortbread-Almond Topping: Instead of plain flour and oats, we use crushed shortbread cookies and almond flour for a bakery-style crunch that stays crisp for days.
• Perfect Texture (No Soggy Bottoms!): By pre-cooking the blueberry filling and slightly adjusting the cornstarch, we guarantee a perfectly scoopable, jammy texture every single time.

Prep time: 20 minutes | Cook time: 30-35 minutes | Yields: 6 servings

Ingredients You’ll Need

1. The Bright Blueberry Filling

• Fresh Blueberries (4 cups): Fresh is best here to maintain texture.
• Granulated Sugar (6 tablespoons or ⅜ cup): To sweeten the berries naturally.
• Cornstarch (3 ½ tablespoons): Our secret weapon. We bumped this up slightly from 3 tablespoons to ensure the filling sets beautifully and doesn’t get watery.
• Fresh Lemon Juice (4 teaspoons or 1 tablespoon + 1 teaspoon): For that essential citrus punch.
• Lemon Zest (2 teaspoons): To bring out the bright lemon oils.
• Vanilla Extract (1/2 teaspoon): To add warmth.
• Salt (1/8 teaspoon): Just a pinch to balance the sweetness.

2. The Creamy Mascarpone Layer

• Mascarpone Cheese (6 ounces): Slightly softened.
• Granulated Sugar (4 teaspoons or 1 tablespoon + 1 teaspoon): To sweeten the cheese slightly.
• Lemon Zest (2 teaspoons): To carry the citrus flavor through the creamy layer.
• Vanilla Extract (1/2 teaspoon)

3. The Shortbread Almond Crumble Topping

• Crushed Shortbread Cookies (2/3 cup): Think Walker’s shortbread or similar high-quality butter cookies.
• All-Purpose Flour (2/3 cup)
• Almond Flour (6 tablespoons): Adds a wonderful nutty flavor and delicate crumb.
• Light Brown Sugar (6 tablespoons): For a touch of caramelization.
• Cold Unsalted Butter (6 tablespoons): Cubed. Keep it cold so your topping clumps perfectly!
• Ground Cinnamon (1/4 teaspoon)
• Salt (1/8 teaspoon)

🥧 More Cozy Fruit Bakes to Try Next:

• Love the sweet crunch of almonds with your berries? Try these gluten-free Almond Flour Blueberry Muffins.
• Want a classic, comforting oat topping? You will love this warm Apple Blueberry Crisp Recipe!

The Best Baking Dish to Use

Choosing the right pan is crucial to prevent the filling from spreading too thin or bubbling over:

• ⭐ Best Choice: A 7-cup Pyrex rectangular baking dish (approx. 7″ × 11″). It offers the perfect surface-area-to-depth ratio.
• Great Alternatives: A 1.5-quart oval baking dish or an 8-inch square baking dish (which will give you a slightly deeper, extra-thick crumble).
• What to Avoid: Do not use a traditional 9×13-inch baking dish. The filling will spread too thin and dry out.

Step-by-Step Instructions

Step 1: Pre-Cook the Blueberry Filling

Because nobody likes a watery, loose crumble, we are going to pre-cook the filling.

1. In a medium saucepan, combine the blueberries, sugar, cornstarch, lemon juice, lemon zest, vanilla extract, and salt.
2. Cook over medium heat, stirring gently, for about 5 to 7 minutes until the mixture thickens, bubbles, and resembles a luscious blueberry pie filling.

3. Pour the hot filling directly into your chosen baking dish.

Step 2: Make the Mascarpone Layer

In a small bowl, whisk together the mascarpone cheese, sugar, lemon zest, and vanilla extract until smooth.

Step 3: Mix the Shortbread Crumble Topping

In a medium bowl, combine the crushed shortbread, all-purpose flour, almond flour, light brown sugar, cinnamon, and salt. Add the cold, cubed butter. Work the butter into the dry ingredients with your fingers or a pastry blender until the mixture forms clumpy, buttery crumbs.

Step 4: Assemble and Bake

1. The Mascarpone Dollops: Take spoonfuls of the sweetened mascarpone mixture and dollop them evenly over the warm blueberry filling. Do not spread them out—leaving them in distinct dollops creates pockets of creamy goodness in every bite.
2. The Crumble: Evenly sprinkle the shortbread-almond crumble topping over the entire dish, covering both the berries and the mascarpone dollops.
3. Bake: Bake at 350°F (175°C) for 30 to 35 minutes. Check around the 30-minute mark; the topping should be golden brown and the blueberry filling should be bubbling lazily around the edges.

Chef’s Tips for Success

• Why the 3 1/2​ tablespoons of cornstarch matters: If you’ve ever ended up with a soup-like dessert, it’s usually because the berries released too much water. Pre-cooking the filling with 3 1/2​ tablespoons of cornstarch guarantees a beautifully thick, jammy texture that holds its own next to the creamy mascarpone.
• Let it Rest: As tempting as it is to scoop into this dessert immediately, give it 15–20 minutes to cool slightly. This lets the mascarpone firm up and the blueberry filling set completely.

Staub Ceramic 7×11 rectangular baking dish: This is the exact white baker I used. It distributes heat beautifully and transitions perfectly from oven to table.

Stainless Steel Pastry Cutter: My absolute favorite tool for cutting cold butter into the shortbread-almond crumble topping without melting it.

Walkers Pure Butter Shortbread Fingers: If you want that perfect buttery crunch, these are the exact high-quality cookies I recommend crushing up!

FAQ’s

🫐 Craving More Berry Desserts?

If you love baking with fresh, seasonal fruit, add these reader favorites to your baking list:

• Easy and Delicious Berry Cobbler (Perfect for using up a mix of summer berries!)
• Gluten Free Blackberry Cobbler (Warm, bubbly, and incredibly simple.)
• Apple Blueberry Pie (A beautiful twist on a classic double-crust pie.)

Did You Make This Recipe?

I would love to see how your Lemon Blueberry Mascarpone Crumble turned out! If you bake this, please leave a star rating and a comment down below—it helps other bakers find my recipes, and I absolutely love reading your feedback.

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Happy baking!